WebGLRenderingContext.getUniform()

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WebGL APIWebGLRenderingContext.getUniform() 方法返回指定位置的全局变量的值。

语法

any gl.getUniform(program, location);

参数

program
包含全局变量的一个WebGLProgram
location
包含要获取的全局变量位置的 WebGLUniformLocation 对象。

返回值

返回的类型取决于全局变量的类型:

变量类型(着色器内) 返回值类型
在WebGL 1中支持的
boolean GLBoolean
int GLint
float GLfloat
vec2 Float32Array (with 2 elements)
ivec2 Int32Array (with 2 elements)
bvec2 Array of GLBoolean (with 2 elements)
vec3 Float32Array (with 3 elements)
ivec3 Int32Array (with 3 elements)
bvec3 Array of GLBoolean (with 3 elements)
vec4 Float32Array (with 4 elements)
ivec4 Int32Array (with 4 elements)
bvec4 Array of GLBoolean (with 4 elements)
mat2 Float32Array (with 4 elements)
mat3 Float32Array (with 9 elements)
mat4 Float32Array (with 16 elements)
sampler2D GLint
samplerCube GLint
在WebGL 2中新增支持的
uint GLuint
uvec2 Uint32Array (with 2 elements)
uvec3 Uint32Array (with 3 elements)
uvec4 Uint32Array (with 4 elements)
mat2x3 Float32Array (with 6 elements)
mat2x4 Float32Array (with 8 elements)
mat3x2 Float32Array (with 6 elements)
mat3x4 Float32Array (with 12 elements)
mat4x2 Float32Array (with 8 elements)
mat4x3 Float32Array (with 12 elements)
any sampler type GLint

示例

var loc = gl.getUniformLocation(program, 'u_foobar');
gl.getUniform(program, loc);

//code in vertex-shader
//...
//uniform mat4 uNormalMatrix;
//...
//gl.getUniform(program,gl.getUniformLocation(program,"uNormalMatrix"))
//>Float32Array(16) [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

规范

规范 状态 注解
WebGL 1.0
getUniform
Recommendation Initial definition for WebGL.
OpenGL ES 2.0
glGetUniform
Standard Man page of the (similar) OpenGL ES 2 API.
WebGL 2.0
getUniform
Editor's Draft Updated definition for WebGL.
OpenGL ES 3.0
glGetUniform
Standard Man page of the (similar) OpenGL ES 3 API.

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
getUniformChrome Full support 9Edge Full support 12Firefox Full support 4IE Full support 11Opera Full support 12Safari Full support 5.1WebView Android Full support YesChrome Android Full support 25Firefox Android Full support YesOpera Android Full support 12Safari iOS Full support 8Samsung Internet Android Full support 1.5
WebGL2Chrome Full support 56Edge Full support 79Firefox Full support 51IE No support NoOpera Full support 43Safari No support NoWebView Android Full support 58Chrome Android Full support 58Firefox Android Full support 51Opera Android Full support 43Safari iOS No support NoSamsung Internet Android Full support 7.0

Legend

Full support  
Full support
No support  
No support

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